This report describes the typical weather at the Roseburg Regional Airport (Roseburg, Oregon, United States) weather station over the course of an average October. It is based on the historical records from 1990 to 2012. Earlier records are either unavailable or unreliable.
Roseburg, Oregon has a mediterranean climate with dry warm summers and mild winters. The area within 25 mi of this station is covered by forests (95%) and croplands (4%).
The month of October is characterized by very rapidly falling daily high temperatures, with daily highs decreasing from 74°F to 59°F over the course of the month, exceeding 85°F or dropping below 51°F only one day in ten.
Over the course of October, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 1:24 hours, implying an average day-over-day decrease of 2.7 minutes.
The shortest day of the month is October 31 with 10:18 hours of daylight; the longest day is October 1 with 11:42 hours of daylight.
The earliest sunrise is at 7:11am on October 1; the latest sunset is at 6:54pm on October 1; the latest sunrise is at 7:48am on October 31; the earliest sunset is at 6:06pm on October 31.
Daylight savings time is observed in 2012 but it neither starts nor ends in October, so the entire month is in daylight time.
The median cloud cover ranges from 33% (mostly clear) to 76% (partly cloudy). The trend is for the sky to be becoming very rapidly cloudier with the median cloud cover increasing by 43% from the start to the end of the month.
On October 1, the clearest day of the month, the sky is clear, mostly clear, or partly cloudy 49% of the time, and overcast or mostly cloudy 32% of the time.
On October 31, the cloudiest day of the month, the sky is overcast, mostly cloudy, or partly cloudy 55% of the time, and clear or mostly clear 26% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around October 31, occurring in 48% of days. Precipitation is least likely around October 1, occurring in 25% of days.
Throughout October, the most common forms of precipitation are light rain and moderate rain.
Light rain is the most severe precipitation observed during 58% of those days with precipitation. It is most likely around October 31, when it is observed during 28% of all days.
Moderate rain is the most severe precipitation observed during 31% of those days with precipitation. It is most likely around October 30, when it is observed during 15% of all days.
Either snow is exceptionally unlikely to fall at this location in October or this station does not reliably report precipitation types.
The relative humidity typically ranges from 41% (comfortable) to 95% (very humid) over the course of a typical October, rarely dropping below 24% (dry) and reaching as high as 100% (very humid).
The air is driest around October 1, at which time the relative humidity drops below 50% (comfortable) three days out of four; it is most humid around October 31, rising above 93% (very humid) three days out of four.
Dew point is often a better measure of how comfortable a person will find the weather than relative humidity because it more directly relates to whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid.
Over the course of a typical October, the dew point typically varies from 40°F (dry) to 52°F (very comfortable) and is rarely below 33°F (dry) or above 58°F (comfortable).
Over the course of October typical wind speeds vary from 0 mph to 9 mph (calm to gentle breeze), rarely exceeding 13 mph (moderate breeze).
The highest average wind speed of 3 mph (light air) occurs around October 1, at which time the average daily maximum wind speed is 9 mph (gentle breeze).
The lowest average wind speed of 2 mph (light air) occurs around October 31, at which time the average daily maximum wind speed is 7 mph (light breeze).